Heat radiator



H. O. STEPHENS Nov. 27, 1928.

HEAT RADIATOR Filed Jan. 28, 1926 Howard OStepl'er-IS, by MW Patented Nev. 27, k1928. *i f f;

UNITED STATES PATENT- oFFIcE.

` yHOWARD o. STEPHENS, or PITTSFIELD, MassAcHUsETTskAssIGNoR To GENERA ELECTRIC COMPANY, CORPORATION or NEW YORK.`

l, HEAT RADIATOR.

Application ledl'anuary 28,v 1926.v Serial No. 84,475.

generated in the apparatus while in opera! tion. The general object of the' invention is to provide an improved arrangement for securing the upper and lower endsof a heat radiator to an electrical apparatus casing.

Another object of thefinvention is to arrangey a heat radiator having top and bottom headers connected by heat radiating ltubes 'in suchk manner that the headers will not impede the natural upward flow ofr convection ycurrents `of cooling air along the tubes. o

Other objects and advantages will appear from the following description of one embodiment of the invention taken in connection with the accompanying drawing in which Fig. 1 shows one side of a transformer casing provided with a heat radiator constructed in accordance with the invention, Fig. 2 is a face view ofthe upper end of the radiator showny in Fig. 1 and Fig. 3 is a detail sectional view on the line 3-3 of" Fig. 2.

Like reference characters indicate similar parts in the different views of the drawing.y

The particular form of radiator shown in the drawing includes a `top header 10 and a bottom header 11- connected by a plurality of heat radiating tubes 12. Each of the headers 10 and 11 is formed with two opposite metal walls 13 and 14 spaced a short distance apart by a metal ystrip 15 joining their edge portions, the joints being oil tight and preferably welded. The flat headers so n formed are disposed'vertically and are connected by the heat radiating tubes 12 which are offset from the vertical plane of the headers and have their uppery and lower ends curved. in to connect with the headers through the outer vertical walls 14 of the headers to whichr the ends of.v the tubes 12 are welded. The tubes lmay be flattened, if desired, as

4 shown in the drawing. 1

The radiator is secured toy andy supported by a pair of short flanged tubes 16 welded into the wall of the transformer casing 17.

A reinforcing plate .18.welded to the wall 13 g of each header fits againstth'e outer face of the flange of one of the flanged tubes 16,' the headers communicating with the transformer casing 17 throughv openings in the walls 13 i the reinforcing plates r18 and the Banged ktubes 16. The reinforcing plates l18 with)k l their headers 10 and 11 are secured to the flanges of the flanged tubes 16 by bolts 19 whichare surrounded by tubes 20 to seal them from the cooling liquid in the headers, the two ends of each tube 2O being welded to the reinforcing plate 18 and the wall 14 of the header.` Shoulders around the bolt holes in the reinforcing plates 18 receive the ends of the ltubes 20 and relieve thev Welded joints of all strain when the bolts are tightened.

The flat vertically disposed form of header which is rprovided bythe present invention not only avoids interference with ascending convection currents of cooling air along the tubes 12 but also vpermits the bolts 19 which secure the headers in place on the flanged tube 16 to extend through without undue ylength to vthe outer walls of the headers. The outer walls 14 ofthe headers to which the radiating tubes 12 are attached arethus directly and strongly supported so that the headers themselves are largely relieved of strain due to the weight of the tubes 12 and the cooling liquid which they contain.

Having described aparticular embodiment ofthe invention,k it is to be understood that this is merely illustrative and thatvarious modifications may be made within the scope of the, invention as pointed out in the ap pended claims. n

Vhat I claim as new and desire to secure byLetters Patent of the United States is:

1. The combination with an electrical apparatus casing of a heat radiator comprising a top header and a bottom header, said headers being secured to the side wall of said casing, each of said headers having a substantially vertically disposed wall, anda plural ity of heat radiating tubes offset from the plane of said vertically `disposed walls, the endsof said tubes being curved in and secured to said walls, whereby ascending currents of cooling air` along the tubes are not impeded by said headers.

2. The combination with an electrical .apparatus casing of a heat radiator comprisingv a top header and a bottom header, each of said "headers having opposite substantially vertically disposed walls, means for securing said headers to the side walls of said cas. ing, the securing means for each header extending through both of its said walls, and a oti'set from the plane thereof, whereby ascending currents oi cooling air along the tubes are not impeded by said headers.

3. The combination With an electrical apparatus casing of a. heat radiator' comprising a top header and a bottont header, each of said headers having opposite substantially vertically disposed Walls, tubes extending through said headers and sealed to their opposite Walls, means extending through said by the headers.

In witness whereof, I have hereunto set my hand this 22nd day of Jan., 1926.

HOVARD O. STEPHENS. 

